International stardom came in David Lean's "Lawrence of Arabia." With only a few minor movie roles behind him, O'Toole was unknown to most moviegoers when they first saw him as T.E. Lawrence, the mythic British World War I soldier and scholar who led an Arab rebellion against the Turks.
His sensitive portrayal of Lawrence's complex character garnered O'Toole his first Oscar nomination, and the spectacularly photographed desert epic remains his best known role. O'Toole was tall, fair and strikingly handsome, and the image of his bright blue eyes peering out of an Arab headdress in Lean's film was unforgettable.
Playwright Noel Coward once said that if O'Toole had been any prettier, they would have had to call the movie "Florence of Arabia."
Prime Minister David Cameron said Sunday the movie was his favorite film, calling O'Toole's performance "stunning."
In 1964's "Becket," O'Toole played King Henry II to Richard Burton's Thomas Becket, and won another Oscar nomination. Burton shared O'Toole's fondness for drinking, and their off-set carousing made headlines.
O'Toole played Henry again in 1968 in "The Lion in Winter," opposite Katharine Hepburn, for his third Oscar nomination.
Four more nominations followed: in 1968 for "Goodbye, Mr. Chips," in 1971 for "The Ruling Class," in 1980 for "The Stunt Man," and in 1982 for "My Favorite Year." It was almost a quarter-century before he received his eighth and last, for "Venus."
Seamus Peter O'Toole was born Aug. 2, 1932, the son of Irish bookie Patrick "Spats" O'Toole and his wife Constance. There is some question about whether Peter was born in Connemara, Ireland, or in Leeds, northern England, where he grew up, but he maintained close links to Ireland, even befriending the country's now-president, Michael D. Higgins.
Ireland and the world have "lost one of the giants of film and theater," Higgins said in a statement.
After a teenage foray into journalism at the Yorkshire Evening Post and national military service with the navy, a young O'Toole auditioned for the Royal Academy of Dramatic Art and won a scholarship.
He went from there to the Bristol Old Vic and soon was on his way to stardom, helped along by an early success in 1959 at London's Royal Court Theatre in "The Long and The Short and The Tall."
The image of the renegade hell-raiser stayed with O'Toole for decades, although he gave up drinking in 1975 following serious health problems and major surgery.
He did not, however, give up smoking unfiltered Gauloises cigarettes in an ebony holder. That and his penchant for green socks, voluminous overcoats and trailing scarves lent him a rakish air and suited his fondness for drama in the old-fashioned "bravura" manner.
A month before his 80th birthday in 2012, O'Toole announced his retirement from a career that he said had fulfilled him emotionally and financially, bringing "me together with fine people, good companions with whom I've shared the inevitable lot of all actors: flops and hits."
"However, it's my belief that one should decide for oneself when it is time to end one's stay," he said. "So I bid the profession a dry-eyed and profoundly grateful farewell."